Those temps are reasonable for a 4.4 Ghz OC on a 2500k. BF3 stresses the GPU so im sure your case gets a lot hotter than just stressing the CPU. Max Tcase is 72.6°C Im not sure what temps your reporting but Tcase will be about 8-10c lower than the core temps so max core temp around 80c. In any case your not close to hitting the max temps so you should be fine.
tcase is not important. tcase is the the temperature of the heat spreader. everyone references tj max which is core temperature and its max value is 105*c i believe. tcase is much lower then tj max or just simply core temps because it is not directly on the core itself where most of the heat is generated.
i like to draw the temperature comparisons of laptop temps and desktop temps. on the desktop everyone is so worried about going over 70 or 80*c but laptops with the exact same chip essentially routinely go higher then that. hell my sb laptop idles at 60*c and hits 95*c during rendering.
trust intel, if your temps where dangerous it would throttle itself or shut itself down. dont worry.